The following table gives the lifetimes of $400$ neon lamps: Represent the given information with the help of a histogram.
Life Time (in hours) Number of lamps
300 – 400 14
400 – 500 56
500 – 600 60
600 – 700 86
700 – 800 74
800 – 900 62
900 – 1000 48

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Solution

Histogram:
Hence, the histogram representation of the given data is as shown above.

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400

700

Lifetime (in hr)	300−400	400−500	500−600	600−700	700−800	800−900	900−1000
Number of lamps	14	56	60	86	74	62	48

The following table gives the life times of neon lamps:

Length (in hours)

Number of lamps

300 − 400

400 − 500

500 − 600

600 − 700

700 − 800

800 − 900

900 − 1000

(i) Represent the given information with the help of a histogram.

(ii) How many lamps have a lifetime of more than 700 hours?

The following table gives the lifetimes of $400$ neon lamps: How many lamps have a lifetime of more than $700$ hours?

(i)

(i i)

700

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